DP Biology (first assessment 2025)

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Question 19N.1A.HL.TZ0.3

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Date November 2019 Marks available [Maximum mark: 1] Reference code 19N.1A.HL.TZ0.3
Level HL Paper 1A Time zone TZ0
Command term Determine Question number 3 Adapted from N/A
3.
[Maximum mark: 1]
19N.1A.HL.TZ0.3

Which statement provides evidence for endosymbiosis?

A. Early prokaryotes contributed to a large increase in oxygen in the atmosphere.

B. Eukaryotic mitochondria and chloroplasts have their own circular DNA.

C. Certain groups of ancient prokaryotes developed mechanisms to carry out aerobic respiration.

D. Experiments by Miller and Urey produced simple organic molecules in abiotic conditions.

[1]

Markscheme

B

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